On 2011/01/14, at 04:47 , Jim Elwell wrote: > Most technical work I have been involved in eschews centimeters, and pixels > per millimeter would be preferred.
I support Jim's view on this. As examples, consider the numbers you get when you scan a 35 millimetre film slide. * 100 pixels per millimetre is adequate to resolve approximately 50 lines per millimetre. * 150 pixels per millimetre is adequate to resolve approximately 80 lines per millimetre. This site is quite specifically technical for its subject but it shows a practical application of 'pixels per millimetre' and a detailed explanation of 'lines per millimetre' http://www.indieshd.com/2010/02/16/what-is-mtf It looks like, for photographic work, values in pixels per millimetre could be used as whole numbers without decimals and without fractions. Cheers, Pat Naughtin LCAMS Author of the ebook, Metrication Leaders Guide, see http://metricationmatters.com/MetricationLeadersGuideInfo.html Hear Pat speak at: http://www.youtube.com/watch?v=_lshRAPvPZY PO Box 305 Belmont 3216, Geelong, Australia Phone: 61 3 5241 2008 Metric system consultant, writer, and speaker, Pat Naughtin, has helped thousands of people and hundreds of companies upgrade to the modern metric system smoothly, quickly, and so economically that they now save thousands each year when buying, processing, or selling for their businesses. Pat provides services and resources for many different trades, crafts, and professions for commercial, industrial and government metrication leaders in Asia, Europe, and in the USA. Pat's clients include the Australian Government, Google, NASA, NIST, and the metric associations of Canada, the UK, and the USA. See http://www.metricationmatters.com for more metrication information, contact Pat at [email protected] or to get the free 'Metrication matters' newsletter go to: http://www.metricationmatters.com/newsletter to subscribe.
